Apache Spark is a fast and general-purpose cluster computing system. It provides high-level APIs in Java, Scala, Python and R, and an optimized engine that supports general execution graphs. It also supports a rich set of higher-level tools including Spark SQL for SQL and structured data processing, MLlib for machine learning, GraphX for graph processing, and Spark Streaming.
You can download Spark from here, or follow the below instructions to download and install Spark2.2.1.
SSL plays an important role in website, because in the last year Google announced that they will be using HTTPS and SSL as a ranking signal in their search results. This means that using HTTPS and SSL will help improve your site’s SEO.
Using an SSL certificate for your WordPress site means that your data, as well as your users’ data, remains safe from prying eyes. Since WordPress is a particularly large target for hackers due to its popularity and transparency, it’s important to take all the appropriate steps toward securing your site.
If you host a wordpress website by yourself, you may need to install SSL certificate on your website. I found a simple way to install SSL certificate through commands and the most important thing is this SSL certificate is free. Oh yes, you need to have the basic knowledge of SSH, Linux and Bash.
I’ve been developing an Android application recently, and I use Android v7 toolbar in my app instead of ActionBar. When I opened some views with EditText, the toolbar stretched and occupied the whole view. It’s really annoyed, because users cannot see anything when they open this view, unless they close the keyboard.
I attended the AWS Certified Developer – Associate exam on 4th March 2016, and eventually got this certification. I would like to tell you what the AWS Certified Developer – Associate is, and how I prepared for the examination.
What is AWS Certified Developer – Associate?
AWS Certified Developer – Associate is one of the AWS Certifications. AWS offers three categories of certification: Solutions Architect, SysOps Administrator and Developer. Each of these is currently available on an Associate or Professional level. Right now, there are five exams in total, since one exam covers both the Developer and SysOps Administrator on the Professional Level.
This is my task2 challenge. I’ve tried to solve this question, but my result wasn’t good. Although there was no error after testing, I only got 33% score.😰
The summary of question shows as below:
I was given a non-empty unsorted array such as: A = [6, 10, 6, 9, 7, 8]. The amplitude of a subsequence of array A is the difference between the largest and the smallest element in this subsequence. The amplitude of the empty subsequence is assumed to be 0.
These are some of the subsequences of array A and their amplitudes:
[6, 6, 7] has amplitude 1;
[6, 10, 6, 9, 7, 8] has amplitude 4;
[6, 6, 7, 8] has amplitude 2.
If this subsequence of array is called quasi-constant, it means its amplitude does not exceed 1. In the example above, subsequence [6, 6, 7] is the longest possible quasi-constant subsequence of array A.
Now, you are expected to provide a method that takes in an array and returns the maximum number of quasi-constant subsequence of array. In above example, the function should return 3.
Last week, I received an email from a recruiter who asked me to do Codility assessment. I had to answer three questions within 245 minutes. Although I’ve heard about Codility, this was my first Codility test experience. To be honest, it was really difficult to me.
These questions were not easy to understand, so it took me some time to understand each question. Then I tried to answer the questions by Java or Python programming language. Even though I eventually found the solutions and summited the answers, my average score was not good enough. When I finished this assessment, I was very disappointed about myself. I even thought whether I should keep a programmer job.😂😂😂
It seems that more and more companies like to use Codility assessments to evaluate developers, but I don’t think it is a best way to test a programmer’s coding/programmer abilities.